Import Error for Canon EOS 5D Mark III - selecting to import and copy as DNG, Saving to 2016 file by date - worked great as early as yesterday at 11pm. Today I was unable to import any of my studio work today.

Will find the camera, will auto check the files no imported, will allow me to add key words, will even save the key words after the shut down, will give the message Importing files..., will even show that the copy and import photos is trying to work with the line measure at top near LR logo - but will freeze and not move or import a single photo. No setting were changed and there is plenty of room. Using iMac with newest operating system. Can you help? I really need to turn this work around.